Function and Application
The NB8-40 miniature circuit breaker is mainly applicable to the terminal distribution lines of commercial office buildings, residential buildings, and general industrial applications with AC 50Hz, rated voltage up to 230V, and rated current up to 40A, providing overload and short-circuit protection for the lines, and can also perform infrequent switching operations under normal conditions.
Detailed Parameters
| Parameter Category | Parameter Item | Parameter Value |
|---|
| Product Model | | NB8-40 |
| Rated Current (A) | | 1, 2, 3, 4, 6, 10, 16, 20, 25, 32, 40 |
| Rated Voltage (V) | | 230 |
| Rated Frequency (Hz) | | 50 |
| Poles (Times) | | 1P+N |
| Mechanical Life (Times) | | 20000 |
| Electrical Life (Times) | | 10000 |
| Rated Short-Circuit Breaking Capacity (A) | | 6000 |
| Running Short-Circuit Breaking Capacity (A) | | 6000 |
| Rated Insulation Voltage (V) | | 500 |
| Rated Impulse Withstand Voltage (1.2/50) (kV) | | 4 |
| Dielectric Test Voltage (V) | | (50Hz, 1 minute) 2000 |
| Resistance to Humidity and Heat (GB/T2423.4: 55°C/90~96%, 25°C/95~100%) | | 28 Cycles of Circulation |
| Resistance to Vibration (IEC/EN60068-2-6) | | Places without obvious vibration and impact |
| Terminal Block | Terminal Block Type | Column Terminal Block |
| Minimum Wire Cross-sectional Area (mm²) | 1 |
| Maximum Wire Cross-sectional Area (mm²) | 16 |
| Standard Connection Torque (N·m) | 1.2 |
| Maximum Allowable Torque (N·m) | 2 |
| Wire Insertion Depth (mm) | 10 |
| Reference Temperature (°C) | | 30 |
| Operating Ambient Temperature (°C) | | -35~+70 |
| Storage Ambient Temperature (°C) | | -35~+85 |
| Applicable Altitude (m) | | 2000 |
| Tripping Mechanism | | Thermal-Magnetic Tripping |
| Electromagnetic Tripping Type | B Type (3In~5In) | ■ |
| C Type (5In~10In) | ■ |
| D Type (10In~16In) | |
| Enclosure Flame Retardant Rating | | V0 |
| Wiring Method | | Top and Bottom Both Possible |
| Installation Method | | TH35-7.5 Standard Rail |
| Pollution Level | | 2 |
| Protection Level | Direct Installation | IP20B |
| Installed in Distribution Box | IP40B |
| Modular Accessories | | S9, V9, XF9, XF9J, OVT-1, OUVT-1 |
